1021000020220 has 12 divisors (see below), whose sum is σ = 2144100042504. Its totient is φ = 408400008080.

The previous prime is 1021000020181. The next prime is 1021000020241. The reversal of 1021000020220 is 220200001201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1021000020197 and 1021000020206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25525000486 + ... + 25525000525.

It is an arithmetic number, because the mean of its divisors is an integer number (178675003542).

Almost surely, 2^{1021000020220} is an apocalyptic number.

1021000020220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021000020220 is an abundant number, since it is smaller than the sum of its proper divisors (1123100022284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021000020220 is a wasteful number, since it uses less digits than its factorization.

1021000020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51050001020 (or 51050001018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 1021000020220 its reverse (220200001201), we get a palindrome (1241200021421).

The spelling of 1021000020220 in words is "one trillion, twenty-one billion, twenty thousand, two hundred twenty".